Synthesis and luminescence of Sr2CeO4 superfine particles by citrate-gel method

Abstract A strong blue-white emission phosphor Sr 2 CeO 4 superfine particles, containing SrCe 4 O 7 , have been synthesized using a citrate-gel method. The crystalline phase and luminescence properties of superfine particles are reported. The results show that the strong blue-white emission is assigned to Ce 4+ –O 2− charge-transfer transition (CTT) of Sr 2 CeO 4 and is not related to a lattice defect. The emission spectrum of post-heat-treated particles exhibits a broad band maximum at 470 nm, and the emission intensity is not affected by the existence of SeCe 4 O 7 .